Rotary cutting-tool.



W. G. ABBOTT, Jn.

ROTARY CUTTING TOOL.

APPLICATION rILEnIuN2a.I9I1.

1,286,194; Patented Deo. 3, 1918.

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WILLIAM GEORGE ABBOTT, J R., OF WILTON, NEW HAMPSHIRE, ASSIGNOR T0 ATLANTIC TERRA GOTTA COMPANY, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

ROTARY CUTTING-TOOL.

Specication of Letters Patent.

Patented Dec. 3, 1918.

j Application led J'une 28, 1917. Serial No. 177,494.

To all whom it may concern:

Be it known that L WILLIAM G. ABBOTT, J r., a citizenof the United States, and resident of WVilton, in the county of Hillsborough and State of New Hampshire, have invented new and useful Improvements in Rotary Cutting-Tools, of which the lfollowing is a specification. j

Thisinvention relates to a device for cutting away or routing out the faces of objects of A various kinds and is particularly designed for so-oalled rabbeting or cutting out depressionsin the faces of plaster models from which are made building blocks or bricks of terra-cotta, cement, clay or similarmaterials, or for rabbeting the blocks themselves, this invention being a divisional continuation of my prior application Sr. No. 11,589, filed March 2, 1915', for cutting machines. It will be understood that the blocks are usually made in molds. formed from plaster models, but the invention is equally applicable tol recessing or rabbeting either the models or the blocks themselves, whichy are made yin the molds, or for any other similar purpose.

In `preparing blocksl of this character it has been customary to dig out or chip out by hand depressions or recesses in the faces ofthe models corresponding to the desired contour ofthe faces of the blocks which are to be juxtaposed in building, and to plane ofi' or level 'the surfaces surrounding the depressions so that a close and even joint may be secured between adjacent blocks, the depressions in the blocks usually being filled with cement or mortar. This method of formingv the depressions, whether in the models or in the blocks themselves, is slow, crude and expensive, and it is a principal object of the present invention to provide a toollwhich will icut said depressions quickly, danger of breaking or cracking the work. Other objects of the invention are to provide a' tool which is exceedingly simple and inexpensive j tov construct, which may be readily sharpcned, which is adapted to be advanced either axially into the work or to bemoved along the' face of' thel work and which may be readily assembled and disassembled.

` Other fobjects ofthe invention will loe apparent4 from the following description andthe accompanying drawings, in which,-a

Figure 1 is a side elevation of one embodiment of the invention; ,l

Fig. 2 is a front elevation of the embodiment shown in Fig. 1;

Fig. 3 is a top plan view ofthe embodi` ment-shown in Figs. 1 and 2;

. Fig. l is a side elevation of another embodiment of the invention;

Fig. 5 is a front elevation of the embodiment shown in Fig. 4L; and

Fig. 6 is a top plan view of the embodiment shown in Figs. f1 and '5.

As fully described vin my prior application, my improved cuttingtool is a rotary tool intended first to be moved directly into the work along its axis, thereby to drill or rout a circular recess in the face of the work, and then to be moved along the face of the work in order to cut anelongate recess in the work. In order to cut either directly into the work or along the face of the work it is necessary to provide cutting yedges Vnot only at the forward end ofthe tool but also along the lateral portions of the tool. To this end I provide a tool, the operative portion of which comprises a bail-shapedblade 17 which is preferably in the form of a band of metal and which is so shaped as to have cutting edges 2 and Bat its forward end and cutting edges L1 and 5 at its sides. The lateral cutting edges are preferably disposed obliquely with respect to the axis of the tool; and while I may make the entire lateral portions of the bail-shaped blade oblique to the axis of the tool, as disclosed in the parent application, I prefer to make only the forward parts ofthe lateral portions oblique to the axis ofthe tool, making the extreme ends of the blade substantially parallel with the axis of the tool.

Thus, in the embodiment shown i in Figs. 1, 2 and 3, the blade 1 having the forward cutting edges 2 and 3 and the oblique cutting edges 4 and 5is provided with portions 6 and 7 which are disposed in planes substantially parallel with the axis of the tool. The lateral portions 6 and 7 vare disposed equidistant rfrom the axis of the tool and they are preferably mounted in recesses 26 inthe periphery of a body-.havingI an exterior surface of revolution concentric with the axis'of the tool; I While the' body may be either solid or hollow, I preferablymake it solid in the form of a disk, and while the surface may have zany suitable contour.l oi'i,. v l

shown in Figs. 1, 2 and 3, buthavingsmooth revolution, as for example a conical contour as disclosed in the parent application, lprefer to make the elements of the surface substantially straight and substantially parallel with the axis,of the tool, that 1s, Iprcfer to employ a cylindrical disk. vSuch a disk is shown at 8 in Figs. 1, 2 'and 3, andk for the purposezomountingthe disk 1n amachine for Vdriving the tool, a tapered shank 9 1s provided at the rear of the disk, to be used in the well-known manner.

`The cutting blade 1 shownin Figs., 1, 2"

and 3 is'preferablyv ormedin the following manner: AA flat band of suitable metal 1s iirst twisted at itscentravljportion, namely, at 10, through anangle ot' approximately 30. pointsll andy l2disposed equal distances from the central point-on opposite sides oi 1 the central point lthrough angles of approximately 45. rlhe 'band isythen bent in the same. direction at points 13. and 14 through angles of.V approximately .so that the lateral portions 6 and.' 7 will lie along opposite sides of Ythe disk 8. The bends 'at points v11, 12, 13, and 14 are preferably disposed perpendicularly to the central line of the band of metal, although theymayif desired,` be slightly oblique to the central line of the band. u

Then the Vband is thus ,formed it pre sente salient cuttingedges 2 and3-facing in opposite directions on opposite sidesl oic the axis of thetool, and it also causesthe oblique cutting.;'edgesjiV and `5 and the lateral cuttingA edges 15 and 1G to project outwardly a greater distance from the vaxis of the tool than the vportions oftheblade disposed to the rear of these edges, thereby` affording sufiicient clearance for the cutting edges throughout the entire length of the blade. These cutting edges are preferably sharpened, andl prefer to grind the blade onthe inside so that the cutting edgesslope inwardly.- Obviously, the cutting edges t. 4 and 15 .disposed on one side of the axis u face in one direction (Fig. 2), while the cutting edges3, 5 and`16 disposed on the other side of the axis face ,inthe opposite direction. These edgesmav be sharpened either :before or after the blade has been bent into the form shown, but itis preferablyfgroundbeforebeing bent. Y Y

In .the embodiment of the invention shown in Figs. v4, 5 and *3; the structure is sub-y stantiallythesame as that shownin Figs. l, 2 and 3,exccpt in that the blade 1, instead of .being bent twice on. each side ol' the axisv is :only bent once von eachlside, namely, at points 17 and 18, these bends be- The band is then bentrearwardly at.

ing through substantially 90. Obviousiy, instead of bending the blade 'sharply through 90o, the bends may be made more gradually so as to provide rounding corners having contours resem-bling the double bendcontour curves. The blade 1 is likewise twistedv in the axial .region to provide salient cutting edges 19 and 20, and is preferably provided with lateral cutting edges 21 and Y22.; kWhile the blade may be secured to the supporting lows; When the tool is 'rst advanced "into contact with the work the forward cutting edges 2 and 3 rst comeinto operationand as the tool advances into thework, the lat.- eraly portions of the blade come into foperationf` While the blade is ordinarily not advanced 'into the worka suiiicient distance to bring the forward face of the disk Sinto the plane of the face of the work, the blades are preferably sharpened .throughout the portions lying along the opposite sides off the support 8 so that the tool may, if desired, kbe advanced into the work until the` rear face of the disk 8 comes into the plane` of the face of the work, and then be moved in kparallelism with ythe tace of the worksov as to cut an elongate slot as described inthe parent application. Where lit is desired merely to ream a circular openingy the toolv may obviously b'e advanced to any desiredl depth, the lateral portions of the blade'not being utilized in this mode of operation;

The term longitudinally yofthe axis of i part transversely of the axis voffthe tool.

l claim: y

1. A rotary tool of the character described comprising a band disposed transversely `of the axis of the tool, the band being twisted'in the region of the axis so as to havesalient operating edges `facing in opposite directions on opposite sides of the axis. i'

2. A rotary tool of the characterde'scribed comprising a band extending radially in op-v posite directions from theaxial region of the toolthe bandy being twisted iny said region so as to have salient operating :edges facing' in opposite directions on opposite: sidesy 'of said region, and means for supporting the band fat its opposite ends. A. l.

3. A rotary tool comprising a'substan* tially flat bail-shaped band extending sy'nr metrically on lopposite sides "ofi thelaxial region of .they tool, the band beingtwisted in said region so as to have `salientdges facing in opposite directions on each side of the region.

4. A rotary tool comprising a substantially at bail-shaped band extending symmetrically on opposite sides of the axial region of the tool, the band being twisted in said region so as to have salient edges facingin opposite directions on each side of the region, and means for supporting the band at its ends.

5. A rotar tool comprising a substantially flat bail-shaped band extending symmetrically on opposite sides of the axial region of the tool, the band being twisted in said region so as to have salient edges facing in opposite directions'on each side of the region, and a member having a surface of revolution concentric with the axis of the tool, the ends of said band extending along said surface and being secured thereto.

6. A rotary tool comprising a disk concentric with the axis of the tool, and a bailshaped blade extending forwardly from the disk substantially in an axial plane of the tool and having its ends secured to the periphery of the disk, the blade having salient cutting edgesfacing in opposite directions on opposite sides of the axial region of the tool.

7 A rotary tool comprising a disk concentric with the axis of the tool, and a bailshaped blade extending forwardly from the disk substantially in an axial plane of the tool and having itsl ends secured to the periphery of the disk, the blade having salient cutting edges facing in opposite directions on opposite sides of the axial region of the tool and having the cutting edges extending along at least a part of the portions of the blade which are disposed longitudinally of the axis of the tool.

8. A rotary cutting tool comprising a cutn ting band disposed substantially symmetrie cally with respect to the axis of the tool, the band being twisted in the axial region of the tool so as to have salient cutting edges Copies of this patent may be obtained for facing in opposite directions on opposite sides of said region and being bent on oppo site sides of said region so as to form a bailshaped blade.

9. A rotary cutting tool comprising a cutting band dlsposcd substantially symmetrically with respect to the axis of the tool, the band being` twisted in the axial region of the tool so as to have salient cutting edges facing in opposite directions on opposite sides of said region and being so bent on opposite sides of said region that the ends of the band are disposed longitudinally of the axis of the tool and that portions intermediate said ends and said regions are disposed relatively obliquely to the axis of the tool.

10. A rotary cutting tool Comprising a cutting band disposed substantially symmetrically with respect to the axis of the tool, the band being twisted in the axial region of the tool so as to have salient cutting edges facing in opposite directions on opposite sides of said region and being twice bent on each side of said region so that the ends of the band are disposed in planes substantially parallel to the axis of the tool and so that the portions intermediate the bends on each side are oblique to the axis of the tool.

11. A rotary tool of the character described, comprising a substantially cylindrical support concentric with the axis of the tool, and a bail-shaped cutting band secured at its opposite ends to opposite sides of the periphery of the band.

l2. A rotary cutting tool comprising a bail-shaped band disposed substantially concentrically with respect to the axis of thc tool and being twisted in the axial region of the tool so as to present salient edges, the edges being ground on the inside throughout the central and lateral portions of the bailshaped band.

Signed by me at W'ilton, New Hampshire, this 21st day of June 1917.

WILLIAM GEORGE ABBOTT, JR.

five cents each, by addressing the Commissioner of Patents,

Washington, D. C. 

